<a href="http://www.hk24.de/en/" target="_blank">Hamburg's Chamber of Commerce</a> is one of the oldest classical buildings in the city - but in order to keep with the times it needed a modern renovation. The historic building couldn't undergo just any renovation, so to provide the necessary space <a href="http://behnisch.com/" target="_blank">Benisch Architecten</a> inserted a shining modern addition in the main hall. <a href="http://behnisch.com/projects/173" target="_blank">Haus im Haus</a> is a light-filled glazed gem completely lit with LEDs which contrast nicely with the heavy, classical architecture of the rest of the chamber.

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Haus im Haus-Benisch Architecten

<a href="http://behnisch.com/" target="_blank">Benisch Architecten</a> won 1st prize in an architecture competition to design a renovation for the historic <a href="http://www.hk24.de/en/" target="_blank">Handelskamer</a>, which serves as Hamburg's Chamber of Commerce.

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Haus im Haus-Benisch Architecten

Originally, the plan was to insert a large 3-story module inside the large hall, but Benisch Architecten's plan called for a taller 5-story insert that would have a smaller footprint to exploit the hall's height and accentuate the space.

The uppermost level affords access to generous roof terraces and beautiful views out over the roofs of Hamburg through a band of arched clerestory windows.

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Haus im Haus-Benisch Architecten

Haus im Haus is more of a functional sculpture within the building than a renovation.

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Haus im Haus-Benisch Architecten

The light and translucent materials contrast with the historic hall’s ponderous stone bulk.

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Haus im Haus-Benisch Architecten

Each floor seems to float above the rest, making the addition seem like an airy staircase to the heavens. (This impression is reinforced by an arched ceiling painted with stars.)

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Haus im Haus-Benisch Architecten

The new addition is matched to the rest of the building, and a number of entrances and exits interweave into the building to improve circulation.

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Haus im Haus-Benisch Architecten

Square LED modules are inserted into the ceilings throughout the new structure.

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Haus im Haus-Benisch Architecten

Haus im Haus is said to be the first structure in the world lit by LEDs.

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Haus im Haus-Benisch Architecten

The project was completed in 2007 and has since received a number of awards, including the 2008 Building of the Year award presented by the <a href="http://www.aivhh.de/">Architekten- und Ingenieurverein Hamburg e.V.</a> and a <a href="http://www.worldarchitecturenews.com/index.php?fuseaction=wanappln.projectview&amp;upload_id=21407" target="_blank">2012 WAN Adaptive Re-Use Award</a>.

Haus im Haus-Benisch Architecten

Hamburg's Chamber of Commerce is one of the oldest classical buildings in the city - but in order to keep with the times it needed a modern renovation. The historic building couldn't undergo just any renovation, so to provide the necessary space Benisch Architecten inserted a shining modern addition in the main hall. Haus im Haus is a light-filled glazed gem completely lit with LEDs which contrast nicely with the heavy, classical architecture of the rest of the chamber.